眼镜架鼻梁边缘抗弯变形测试仪

鼻梁变形测试仪

测试原因：测定镜架具有一定的镜片保留能力，保证镜架可安全佩戴2年或以上，防止镜片因轻微的冲击而脱落或扭拧而变形，影响佩戴效果。

参考标准：EN1836：2005、ISO12870：2004、GB/T14214：2019等等

技术参数：

1、环形夹具直径：25mm±2mm

2、加压杆直径：10mm±1mm

3、运行装置：电动+气动

4、压力值：5N

5、持压时间：5s

6、计时装置：电子显示自动计时

测试方法及标准：

1.确定左右镜片几何中心点，并计算两中心点距离C（参考标准：ISO8624）；

2.在镜片中心点2mm范围内夹住镜片，并使未夹镜片保持水平状态；

3.调整下降压杆，使其落点刚好处于中心点2mm范围内，记下此值为初始值；

4.设定压力为5N，启动仪器，使位移相当于两镜片几何中心距C的10，保持5秒；

5.将压杆回复原位，放松20秒

6.检查镜架是否有裂缝，并测定鼻梁变形百分比（变形量不超过2）。

Edge Transverse Test

Frames to be tested shall be propery glazed.For purposes of unifomity, 6base,2-mm 0.08-in) nominal-centr thickness, V-beveled plano power glass is recommended.The right eyewire of the frame to be tested shal be clamped fimly in the vertical position as wom,with the left eyewire unsupported. A spring balance shall be used to apply a downward force of22.24 Newtons(5-bf) to the endpiece area of the left eye.Pressure shall be released immediately after reaching the 22.24-Newton (5-bf)level. Upon removal of theload, no deformation shal be apparent in the frame.

眼镜架鼻梁边缘抗弯变形测试仪

Flat Transverse Test

Frames to be tested shall be properly glazed.For purposes of uniformity,6-base,2-mm (0.08-in) nominal-center thickness, V-beveled plano power glassisrecommended.The frame to be tested shall be laid on afirm, level supportwith the front lens surface downward so that one eye and one-half of the bridge project beyond the edge of the support. The frame shall be clamped frmly in position.A spring balance shall be used to apply a downward force of 4.45 Newtons(1-lbf)to the projecting endpiece area of the frame.Pressure shall be released immediately afterreaching the 4.45-Newton (1-Ibf)level.Upon removal of the load, no deformation shall be apparent in the frame